Herre is history
I have 2x 50gb verbatim one is gold color 2nd one is white both was bought +- 2 years ago
Everything was fine till some time ago one disc demanded full format and problems just started
After full erase speeds went down to 0.8-1.0 but i was able to burn just twice and after that disc was done
I cant even burn more than 25gbs i was scoring write retrys and then I/O error
So i bought week ago 2 new verbatims BD-RE .
For now i got only speed problem also 0.8-1.0 but 1st was full erase [without space areas] and then zeroing sectors

so is there anyway to fix speeds? burning 48gbs for almost 3 hrs isnt fine.
Burner see disc properly as speed 2x

i am using IMGBURN 2.5.7.0